May Movie Math: It All Adds Up

Your mother always told you that math would be important. As it turns out — and we're not just saying this because it's Mother's Day and flowers are really expensive and we need to start sucking up now — she's right.

We just bet you didn't know that you'd need that math to decide what to see this coming month. From the party that won't stop in "The Great Gatsby" to superheroes galore in "Iron Man 3," here's your arithmetic-driven guide to May 2013, the official beginning of summer movie season.